Via GVR's blog he's put answers up on the ask-a-google-engineer page for the top 20 questions.
I'm seriously laughing here:

Q: "Why google choose python as the main programming?"

A: Incorrect this is.

Oh, and yay multiprocessing (see: this question) but man is there a lot of work to do. I've actually started thinking about/sketching an actor model build on top of MP, using concepts from actors/monitors and things in the ecosystem today